    <SEC-DOCUMENT>0001877939-25-000038-index.html : 20250411
    <SEC-HEADER>0001877939-25-000038.hdr.sgml : 20250411
    <ACCEPTANCE-DATETIME>20250411160640
    ACCESSION NUMBER:		0001877939-25-000038
    CONFORMED SUBMISSION TYPE:	DEFA14A
    PUBLIC DOCUMENT COUNT:		3
    FILED AS OF DATE:		20250411
    DATE AS OF CHANGE:		20250411

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Castellum, Inc.
    		CENTRAL INDEX KEY:			0001877939
    		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-MANAGEMENT CONSULTING SERVICES [8742]
    		ORGANIZATION NAME:           	07 Trade & Services
    		EIN:				274079982
    		STATE OF INCORPORATION:			NV
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEFA14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-41526
    		FILM NUMBER:		25832118

    	BUSINESS ADDRESS:
    		STREET 1:		1934 OLD GALLOWS ROAD
    		STREET 2:		SUITE 350
    		CITY:			VIENNA
    		STATE:			VA
    		ZIP:			22182
    		BUSINESS PHONE:		(703) 752-6157

    	MAIL ADDRESS:
    		STREET 1:		1934 OLD GALLOWS ROAD
    		STREET 2:		SUITE 350
    		CITY:			VIENNA
    		STATE:			VA
    		ZIP:			22182
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEFA14A
    <SEQUENCE>1
    <FILENAME>noticeofinternetavailabili.htm
    <DESCRIPTION>DEFA14A
    <TEXT>
    Document 1 - file: noticeofinternetavailabili.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>castellumincnotice2025_pag.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: castellumincnotice2025_pag.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>castellumincnotice2025_paga.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: castellumincnotice2025_paga.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>